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FTP Client and HttpFileDownloader Components (Controls)

, 25 Jun 2008 CPOL
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FTP client and HttpFileDownloader components (controls).

Introduction

Once I needed a simple, open source, and robust FTP client to include in my project. To my surprise, I was not able to find one in spite of many FTP clients that were published on various websites including CodeProject. The problem was the quality: the published projects were just demos. There were no quality FTP clients.

According to ratings, the most popular CodeProject FTP client is available here: An FTP client library for .NET 2.0. In spite of numerous fixes, the component did not work as I anticipated. And the major problem is not in the fixes (some of them were quite reasonable) - the problem is in the underlying FtpWebRequest component itself.

The component is designed to operate in stateless mode. One can only guess what the reasons were behind such a “wise” decision. FTP is a connection based protocol, and any attempt to fit a connection based protocol into a connectionless component apparently can not work well, by definition. First, what can we possibly benefit out of relinquishing the control over the connection status? The connection will not go away even if you hide it somewhere - it is the protocol's property, not the component’s. I can only think that the designers of this component intended to keep the component in line with HttpWebRequest. But, the difference is that the HTTP protocol is stateless by nature and FTP is not.

FtpWebRequest problems

So, what is wrong with FtpWebRequest? The main problem is the response time. The connection to the server of any FTP client took about 2.5 seconds. FtpWebRequest consistently showed 13.5 seconds (when connected to the same site). No customer would tolerate an extra 11 seconds delay without reason (440% increase). Apart from that, if you do not explicitly set KeepConnectionAlive to false, the system would not work properly. (It is supposed to be false, by default.)

The solution

Luckily, I found a good solution in the aforementioned article's comments. The solution is edtFTPnet. It is an open source library of the highest quality (believe it or not). The library is designed by Enterprise Distributed Technologies. They also have advanced versions of FTP components (with SSL and other features), but they are not free. The only problem with the open source one is that it lacks multithreading support. But that is not a real problem – a multithreading wrapper can be created for almost anything if you have experience. This component is a multithreading wrapper for edtFTPnet designed as a Windows Forms control, with some minor additions like status bar support and threads handling.

Core features

  • Runs in a separate thread.
  • Ability to cancel the transfer at any time.
  • Progress bar support.
  • Displays estimated time left.
  • Displays transfer speed.

How to use the controls

Copy the root directory (and subdirectories) to any location. Create a new tab in the Visual Studio Toolbox. Register the library with the Visual Studio Toolbox by browsing for FTPLib. You will be able to see the controls on the tab.

Drag the control to your form. Place the progress bar on the form. Select your FtpControl and select your status bar in the ProgrBar control’s properties.

Create a status event by selecting and double clicking StatusUpdateEvent.

The rest is quite clear from the samples.

HttpFileDownloader

The second component is a HttpFileDownloader component (control). Both components inherit from the BaseDownloader component.

New version

If a newer version is released, it will be available here.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Alex_1
Web Developer
Australia Australia
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Comments and Discussions

 
NewsMy vote of 5 PinmemberElmue17-Mar-11 16:20 
Hello
 
I did not download your code but your suggestion to use the EDT library instead of Microsoft's Framework safed me a lot of time. Many thanks for your article!
 
I also published an FTP project Partial FTP Downloader on Codeproject. It uses Wininet.dll for FTP downloads in .NET code and resumes broken downloads.
 
This week I downloaded the edtFTPnet library (free version) and tested it throughly. It is really very good.
Nevertheless I found 3 bugs in the library but they are not severe. I reported them but did not receive any answer. The edtFTPnet library started 2003 and I suppose that nobody is working anymore on it. But as you have the sourcecode you can fix any bug on your own.
 
For all those who need to implement FTP into their project, I give here some tipps how to take the decision:
 
1.)
As stated above, FPT built into .NET framework is slow due to a misdesign.
 
2.)
The edtFTPnet library is the best you can get if you need a powerfull FTP client with lots of features.
But the free version does not have Proxy support. (You have to pay a lot of dollars for the Pro version)
 
3.)
Here comes the advantage of using Wininet.dll as in my project:
Wininet.dll is part of Windows and available on all computers.
You don't need any additional libary because Windows already has FTP built in.
It is part of Internet Explorer.
Wininet.dll has only basic funcionality but allows to go through proxy servers.
You don't even have to configure the proxy manually if Internet Explorer is already configured correctly.
 
(If you are programming in C++ you find a Wininet library in my CabLib project here on Codeproject)
 
Elmü
GeneralWindows 7 Pinmembervectoraudiouk7-Apr-10 7:50 
GeneralRe: Windows 7 PinmemberMike Russo28-Jun-10 10:09 
GeneralFtp root folder PinmemberSPdo29-Sep-09 20:59 
GeneralRe: Ftp root folder Pinmembermeocutduoi3-Apr-13 17:30 
Generalregistering dll - adding to Toolbox Pinmembersanicovan25-May-09 8:02 
GeneralRe: registering dll - adding to Toolbox PinmemberAlex_126-May-09 0:01 
GeneralRe: registering dll - adding to Toolbox Pinmembersanicovan26-May-09 4:05 
QuestionResuming? PinmemberNiklas Henricson6-May-09 4:15 
GeneralDownload list of files? [modified] PinmemberAmirtich3-May-09 9:37 
GeneralTHREAD PROBLEM Pinmembermnek8421-Apr-09 2:55 
GeneralSetLocalFolder not working... Pinmemberabakshi18-Dec-08 4:03 
Questionencoding? PinmemberParkInSung1-Dec-08 19:15 
GeneralProblem with edtFTPnet Pinmemberinfoss21-Aug-08 22:49 
GeneralGreat project Pinmemberhardsoft26-Jun-08 13:34 
GeneralRe: Great project PinmemberAlex_126-Jun-08 17:39 
GeneralGood job Pinmemberbilo8125-Jun-08 23:18 
GeneralRe: Good job PinmemberAlex_126-Jun-08 17:52 

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